New and looking to Give my Dad something fun

I have been looking for a good dependable motor set up for my father. he had a wizzer growing up and now is 67 lost a lung to cancer and still loves his beach cruzer but needs help to get back to the house sometimes. so many choices just do not know wich one to get. if i mess up please excuse me i am dumb when it comes to this. but old cars i am gret with. any and all help will be greatly helpful